Telephone-receiver.



PATENTED AUG. 21, 1906.

R. H. MANSON. 4TEMSPHo-NE RECEIVER.

APPLICATION FILED AUG.3,1904.

" firmly narran I, @raras retentir terrien.

.RAY n. Manson, or -infirm'a, omo, assicNoR To THE DEAN antenne COMPANY, @E ELYRA,

0HlO, A CORPORA'HN OF .OHIQ

frsLEPi-ioNE-REGEWE.

To all whom l it `cortcerm Be it known that I, RAY H. MANSON, a citi- Vzen of the United Satama-.residing at Elyria, in

My invention relates to telephone-receivers, and particularly to that type in which .the magnet structure, including allvthe operative parts, with their circuit connections, is made removable from the ineloslng shell. In

this type of instrument it is highly'important, .if notvitally essential, that'the magnet structure, which is composed ofV several parts, should form a rigid mechanical unit when assembled and that the pole-pieces should be held in a delinite position relatively to the diaphragm. and ease in manufacture, the component parts should be simple in design and capable of being readily and quickly assembled.`

.One 'of the objects of my invention thereforev is to produce a receiver the magnet structure of which is composed of few parts, of simple design, which may be readily assembled to form a rigid unit.

A further object is to provide new and eficient integral means for securing the polepieces to the limbs of the permanent magnet K of a telephone-receiver and also for constituting a support for.

the diaphragm.

A further obj ect is to provide a telephonereceivery in which the magnet structure car- 1n .rlgid and operative relation thereto, the whole being bodily removable as a complete unit and operative receiver from a suitableinclosing shell.

A further object is to provide, 1n combination with a magnet structure and diaphragmsupporting cup-shaped member attached thereto, binding-posts formed to receive the terminal tips of the receiver-cord and each having a projection extending inside said lcupy' 4shaped member for connection there with t pole-piece windings.

rther object isto increase the acoustic erties of telephone-receivers. f

Pro

hese and other objects will more fully appear from the followmgspecication, taken' 1n connection with the accompanymgdrawings, whichrset forth anembodiment of my l, invention,

Also for commercial reasons y against the cup-shaped Patntedug. 21k, 1,906.

claims.

- In the drawings, Figure l is a view of a telewhile the novel features are more A particularly pointed out in the appended.

phone-receiver constructed '-in accordance with my invention, the inclosing shell being shown inl longitudinal section and the inclosed parts in elevation. longitudinal section, showing the magnet structure and other operative parts as a complete unit, the inclosing shell being removed.

ig. 3 is another longitudinal section in a plane at right angles to that'of the other figures, some of the parts being shown in elevalation.;

Referring to the drawings, the magnet structure A consists, primarily, of a perma- `nent magnet composed of magnetized steelf bar limbs a a,

connected at one end by a yoke a', of metal, and screw a2. At or near the end of the limbs o, oppositey yoke c', are positioned the soft-iron pole-pieces a3 a3, each oi which preierablyr lies in contact with one of the limbs (L. in order to make a rigid connection for the parts at thisportion of the structure, l provide a bridge-block B and cup-shaped member C, formed preferably ot a single casting of non-magnetic metal.

.Bridge-block B is proportioned to justit between pole-pieces a3 against which the rear ends of the pole-pieces. abut.

member C, and the Fig. 2 is aview in` and has shoulders b,

rlChe ends of the magnet-limbs rest,`

parts are secured inthis position by a bolt b orv by any other suitable means. The polepieesare provided with the usual windings `or bobbins a4 within the chamber of the cu shaped member C, land in promiity to t e pole-piece ends .ina diaphragm D, resting upon the flange of the cup-shaped member,

is secured by means of a screwwhere 1t threaded clamping-ring E. The outer surface of'clamping-ring E is preferably knurled,so Y

that it may be screwed down by hand.

F vis an inclosing shell having a flaring end l to inclose the cup-shaped member-which rests against the flange thereof, where it is secured and clamped in the inclosing shell by the cap A or earpiece F. y

in many receivers as at present constructed the vibrations ofthe dia hragm are to a considerable extent dampe k by the air conined within the chamber of the cup back of IOO , this difficult punching bent upon itself, the opposed flat the diaphragm, the pole-piece openings being practically iilled by the pole-pieces and insufficient to prevent this result. T0 obviate and increase the acoustic properties of the instrument, I provide the cupshaped member with a series of apertures c, which may be of any suitable number or size to permit the air-vibrations set up by the diaphragm to be communicated freely to the column of air within the receiver-shell.

The bridge-block B, in addition to its principal function above described, constitutes a support for the binding-clamps G, which 'are insulated from it by a strip of fiber g. These binding-clamps are each composed of a metal surfaces being provided each with a pair of parallel indentations g', which together form t a socket or way for the cord-circuit terminal tip H, which reaches the socket through Aan aperture g2 in the loop of the bend. The bent portions of the binding-clamps are sprung outwardly slightly and are pressed inward to grip the .terminal tips when screws g3 are screwed home. At the point of attachment tor the binding-clamps bridge-block'B is provided with a plug or insertion 112, of insulating material, such as fiber, extending from side to side. To receive this plug, the bridge-block is cast with a suitable opening, i as shown, at one side of which is a key-ridge b3 to engage a keyway in the plug b2 and keep it from turning. Screws g3 of binding-posts G take into this plug, by which means andl the insulating-strips g each binding-clamp is completely insulated.

Extending toward the diaphragm each binding-clamp has a projection g", which reaches through an aperture in the cupshaped member into the chamber behind the diaphragm, where itis secured by soldering or other means to a Wire of the pole-piece windings. These projections are preferably provided with insulation g5 to prevent contact with adjacent metal parts. The projections also serve as steady-arms 4to prevent the binding-clamps from turning when the screws g3 are tightened. The insulated conductors of the cord-circuit are led in through an opening in the end ofthe shell and secured to yoke (L, and tipsfH are then inserted in the binding-posts A. v

It will be observed that by the above-described construction-an operative receiver is produced independent of the inclosing shell. The. parts may be made very accurately, so that the diaphragm is held rigidly in place without having to depend on the uncertainties ofthe rubber or composition of the in,- closing shell for the poleieee distances from the diaphragm. Also t e receiver can be carried in the stock-room ready for the inclosing shell and any style of outside covering slipped over the working parts that may be desired. Furthermore, if a telephone subscriber should accidentally bre-ak the body or cap of the inclosing shell it will not disable the receiver, andit is to be particularly observed that all circuit connections are made and supported on the cup-block B, so that the magnets can be removed without destroying the connections. It is also to be noted that in assembling this instrument no grinding on final adjustment of the pole-pieces is necessary. The block B is cast 'tinished, threaded, and with the holes to gage to the .001 of an inch. The pole-pieces are stamped or punched out with their holes and ends accurate to the same fraction. When the parts are assembled,the bolt serves as a center, and they fit perfectly with all adjustments.

Having thus described'my invention, what I claim, and desire to secure by Letters Patent, is*

1. In a telephone-receiver, the combination with a magnet structure including a permanent magnet and pole-pieces, of a bridgeblock cooperating with the magnet-limbs and the pole-pieces to 'form a rigid connection, said bridge-block provided with an insulating-plug, a cup-shaped member forming an integral extension of said bridge-block and shaped to constitute a chamber, said cupshaped member being provided with openings through which said pole-pieces extend, windings upon said pole-pieces within the cup, a diaphragm in proximity to said polepiece ends and secured to the rim of tht` cupshaped member by a clamping-ring, suitable electrical connections carried by the plug in said bridge-block, an inclosing shell for all parts, and an ear-piece clamping the parts in the shell. i

2. In a telephone-receiver, the combination with a magnet structure .including a permanent magnet and pole-pieces, of a bridgeblock cooperating with and the pole-pieces to form a rigid connection, a cup-shaped member extending from said bridge-block and shaped to constitute a chamber for the pole-piece ends and their windings, binding-posts or clamps mounted upon opposite sides of said bridge-block but insulated therefrom, each binding post 'or clamp beineV provided with an opening' to receive a coriI-circuit tip and having an extension provided with insulation and passing through thc wall of the cup-shaped member for connection with the pole-picco uindings. and an inclosing shell for thc parts. substantially as described.

In a tclephone-reccivcr. thc combination with a magnet structure including a pci'- manent niagiiet, and pole-pierrsvwith their windings, of a bridge-block cooperating with the magnet-limbs and the polc-picccs to forni a rigid connection, a plug ot insulation cb:- tending transvcrscly through sind bridge-- block )etwecn said imagina-limbs. and cordcircuit tcrininal incans tor connect ion with IOO said magnet-l i nibs IIQ v' A block coperating with themagnet-limbs and pole-piecesto form aA `gid connection, a cupsaid magnet and the pole-pieces, a cup-shaped diaphragm-supporting member integral wit said bridge-'block and forming a rece tacle for the reception of said pole-piece en s an their windings, a diaphragmv supported by said member, a plugin said bridgeieee, and terminal devices connected to thep ug.

8. In a telephone-receiver the combination with a permanent magnet, of a bridgeblock separating.. the limbs thereof, a diaphragm-supporting member integral with said bridge-block, polepieces held between the 'limbs of said magnet and having their said windings mounted upon the magnet structure but insulated therefrom and se'-` cured to said plug, substantially as described. f

4. In a telephone-receiver, the combina tion'with a magnet structure ineludin a per manent magnet, and pole-pieces with their windings, ci a bridge-block cooperating with` the magnet-limbs and poleepieces to vform a rigid connection, said bridge-block being provided with an opening extending transversely between said magnet-limbs and Ahaving a key or ridge, an insulating-plug located in said opening and-formed with a leyway to receive said key, and cord-circuit terminal windings within the diaphragm-supporting means for connection with said windings member, means on the bridge-block forming mounted upon the magnet structure but in- .an abutment for the pole-pieces, terminal desulated'therefrom and secured to said plug, l vices having projecting ends secured to said substantially asdescribed. bridge-block, and means engaging sai 5. In a telephone-receiver', the combination with a magnet structure including a permanent magnet and pole-pieces, of a metallic bridge-block coperating with the magnetlimbs and the pole-pieces to form a rigid con'-I nection, a diaphragm-supporting member.. connected. to said metallic bridge-block, terminal devices mounted upon .said bridgeblock and means carried, by' the terminal4 members wherebythey are prevented from.. turning. x

6.,.111 a telephone-receiver, the combination with a magnet structure includin a per manent magnet and pole-pieces, of abridgeturning.' t i 9.,na telephone-receiver, the combina'- tion with a magnet structure comprising a ermanent magnet and pole-pieces withtheir windings, of a separating device for the pole* pieces and the limbs oi the magnet compris ing anon-magnetic bridge-block having a repieces and an integral cup-shapedlextension ,for the reception of the windings oi said poleieces, a keyed aperture through said bridgehlock, an insulating-plug within said keyed jeetions and secure/dto said'plug, the proiections on said terminalv members adapted to enter apertures in said cup-shaped extension, whereby the terminalmembers arefprevented from turning.

shaped member vforming an integral eXtension on said bridge-block and shaped to constitute a chamber for the pole-piece ends and their windings, terminal clips rigidly secured to said bridge-block and means `engaging said in presenceof two Witnesses. cup-shapedmember whereby ,the terminal RAY H MANSON- clips are prevented from turning.

7. A telephone-receiver comprising a permanent magnet, pole-pieces and their windings, a bridge-block separating the limbs oiE Witnesses:

S. A. BEYLAND, WiLLiAM WfDEAN.

PTO' -jecting ends to prevent said devices from aperture and terminal membcrsi'having pro-v 7 I duced portion `for the reception of the pole- Intestimony whereof l aiiix my signature 

